Guillemette of Neuchâtel
Countess of Montbéliard, suo jure
Born	1260
Died	1317 (aged 56–57) Étobon Castle, near Héricourt, Haute-Saône
Noble family	House of Montfaucon
Spouse(s)	Reginald of Burgundy
Issue	Othenin, Count of Montbéliard Joanna of Burgundy
Father	Amadeus, Count of Neuchâtel
Mother	Jordanna of Arberg

Guillemette de Neufchâtel (1260–1317) was a French noblewoman, the daughter of Amadeus, Count of Neufchâtel and his wife, Jordanna of Arberg.^[1] In 1259, her great-aunt Margaret, married Richard of Neufchâtel-en-Bourgogne. As her dowry, she brought the Lordships of Blamont, Châtelot, Belmont, and Cuisance into the marriage. The Lords of Neufchâtel-en-Bourgogne placed Blamont under the protection of the Duke of Burgundy and thus detached it from Montbéliard.

In 1282, Guillemette married Reginald of Burgundy. They had five children:

• Othenin "the Mad" (d. 1339), who succeeded her as Count of Montbéliard
• Agnes of Montbéliard (d. 1377), married Henry I, Count of Montbéliard, who inherited Montbéliard after Othenin's death
• Joanna (d. 1347), married:
  1. Ulrich III, Count of Pfirt
  2. Rudolf Hesso, Margrave of Baden-Baden
  3. William, Count of Katzenelnbogen
• Margaret, married William of Antigny, Prince of Sainte-Croix
• Adelaide, married John II, Count of Chalon-Auxerre

In 1283, her great-grandfather, Theodoric III, Count of Montbéliard (1205–1283) died. He had outlived all his children and in his will, he left the County of Montbéliard to his great-granddaughter Guillemette. Theobald III of Neufchâtel, who was a grandchild of Theodoric III and who wanted Montbéliard for himself, conspired with Reginald's brother Otto IV to have Montbéliard recognized as a fief of Burgundy. To resolve this, Reginald ceded Blamont and Châtelot to Theobald.

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